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Accrued expenses and other current liabilities
6 Months Ended
Jun. 30, 2021
Payables and Accruals [Abstract]  
Accrued expenses and other current liabilities Accrued expenses and other current liabilitiesAccrued expenses and other current liabilities consist of the following (in thousands):
As of June 30, 2021As of December 31, 2020
Employee compensation$71,749 $55,802 
Manufacturing costs24,186 22,571 
Clinical and contract research organization costs19,865 23,766 
Collaboration costs20,974 20,004 
Property, plant and equipment1,201 789 
License and milestone fees183 278 
Professional fees1,982 1,541 
Other27,895 20,655 
Accrued expenses and other current liabilities$168,035 $145,406